Yamaha - Woodruff Key - Flywheel & Shaft Alignment - 90280-05033-00

Overview

This little woodruff key might not look like much, but it’s doing serious work behind the scenes. It locks components like the flywheel or gear into proper alignment so everything spins exactly how it should. I’ve seen engines run rough or not at all just because this piece was worn or missing. It’s one of those parts you don’t skip if you want your motor running smooth and reliable.

Key Features

• Precision Alignment Fit – Keeps rotating components properly indexed on the shaft.

• Secure Component Locking – Prevents slipping between mating parts under load.

• Hardened Metal Construction – Built to handle torque and long-term engine use.

• Exact Yamaha Specification – Matches factory dimensions for proper seating and performance.

Engine & Boat Compatibility

Used across a wide range of Yamaha outboards in applications involving flywheels, crankshafts, and other rotating assemblies. Common in setups where precise alignment between engine components is critical for timing and performance. Always confirm sizing and placement during installation.

FAQ

Q: What happens if a woodruff key fails or shears?
A: You’ll usually get timing issues, loss of power, or the engine may not start at all.

Q: Can I reuse an old woodruff key?
A: It’s not recommended—once it shows wear or deformation, it’s better to replace it.

Q: Is installation difficult?
A: Not really, but it needs to sit perfectly in the slot—take your time and make sure it’s fully seated.

Q: Does saltwater affect this part?
A: It can over time, especially if corrosion gets in—keeping things clean during service helps a lot.

Q: Why does my flywheel keep slipping even with a new key?
A: That usually points to wear on the shaft or flywheel bore, not just the key itself.